A 0.12-m-radius grinding wheel takes 5.5 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration? (1.6 rad/s?) A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20 s. It is then turned off and coasts to a stop in an additional 40 s. The ratio of the average angular acceleration for the first 20 s to that for the last 40 s is which of the following? (-2) A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20 s. It is then turned off and coasts to a stop in 40 s. In the one minute of rotation, through how many revolutions did the fan turn? (60) A 0.30-m-radius automobile tire accelerates from rest at a constant 2.0 rad/s over a 5.0-s interval. What is the tangential component of acceleration for a point on the outer edge of the tire during the 5-s interval? (0.60 m/s?) A 0.30-m-radius automobile tire accelerates from rest at a constant 2.0 rad/s'. What is the centripetal acceleration of a point on the outer edge of the tire after 5.0 s? (30 m/s?)